ESCI 111 Quiz 4 flashcards |

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Lava flows are typically finer grained than intrusive igneous rocks. Why?

The extrusive magma cools quickly so the mineral grains do not have time to grow.

Which magma is most likely to quench (congeal) to a natural glass?

highly viscous; cools quickly

The sizes, shapes, and arrangements of mineral grains in an igneous rock is known as ________.


________ magma cools and consolidates without growth of mineral grains.


________ mineral grains are of roughly equal size and coarse enough to be seen without a microscope or magnifying glass.


________ rock has two or more distinctly different-sized populations of mineral grains.


________ a magnifying glass or microscope is needed to see individual mineral grains.


A ________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid.


Consider the Bowen's reaction series. Which mineral would you expect to see as a phenocryst in a porphyritic basalt?


Which of the following igneous rocks exhibit aphanitic texture?

andesite, rhyolite

________ is a volcanic rock that is extremely vesicular and glassy.


________ is composed mainly of ferromagnesian minerals.


________ is characterized by very coarse mineral grains?


A (an) ________ texture represents a single, long period of cooling and crystallization.


________ has the same mineral composition as andesite.


Which of the following best describes an aphanitic texture?

The rock is crystalline; mineral grains are too small to be visible without a magnifying lens or microscope.

A ________ texture would be most unlikely to occur in an extrusive igneous rock.


________ is named for a prominent, volcanic mountain range in western South America.


________ is the dominant lava erupted from volcanoes on Hawaii and Iceland.


The last minerals to crystallize on Bowen's Reaction Series result in igneous rocks with a ________ composition.


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